Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Hybrid/EV Battery Temperature Sensor "A" Voltage Out of Range (P0A9B1C,P0AC51C,P0ACA1C,P0AE81C,P0BC21C,P0C331C)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Battery System / Hybrid/EV Battery Temperature Sensor "A" Voltage Out of Range (P0A9B1C,P0AC51C,P0ACA1C,P0AE81C,P0BC21C,P0C331C)

DESCRIPTION

Refer to the description for DTC P0A9B11.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A9B1C

Hybrid/EV Battery Temperature Sensor "A" Voltage Out of Range

The performance of battery temperature sensor 0 is abnormal; the difference in output between it and other battery temperature sensors is excessively large.

  • HV battery
  • Battery ECU assembly

Comes on

Master warning:

Comes on

SAE Code: P0A9C

P0AC51C

Hybrid/EV Battery Temperature Sensor "B" Voltage Out of Range

The performance of battery temperature sensor 1 is abnormal; the difference in output between it and other battery temperature sensors is excessively large.

  • HV battery
  • Battery ECU assembly

Comes on

Master warning:

Comes on

SAE Code: P0AC6

P0ACA1C

Hybrid/EV Battery Temperature Sensor "C" Voltage Out of Range

The performance of battery temperature sensor 2 is abnormal; the difference in output between it and other battery temperature sensors is excessively large.

  • HV battery
  • Battery ECU assembly

Comes on

Master warning:

Comes on

SAE Code: P0ACB

P0AE81C

Hybrid/EV Battery Temperature Sensor "D" Voltage Out of Range

The performance of battery temperature sensor 3 is abnormal; the difference in output between it and other battery temperature sensors is excessively large.

  • HV battery
  • Battery ECU assembly

Comes on

Master warning:

Comes on

SAE Code: P0AE9

P0BC21C

Hybrid/EV Battery Temperature Sensor "E" Voltage Out of Range

The performance of battery temperature sensor 4 is abnormal; the difference in output between it and other battery temperature sensors is excessively large.

  • HV battery
  • Battery ECU assembly

Comes on

Master warning:

Comes on

SAE Code: P0BC3

P0C331C

Hybrid/EV Battery Temperature Sensor "F" Voltage Out of Range

The performance of battery temperature sensor 5 is abnormal; the difference in output between it and other battery temperature sensors is excessively large.

  • HV battery
  • Battery ECU assembly

Comes on

Master warning:

Comes on

SAE Code: P0C34

HINT:

If the vehicle as is left as is for 24 hours, the value of "Hybrid/EV Battery Temperature" will be almost the same as the ambient temperature.

MONITOR DESCRIPTION

If the battery ECU assembly detects a malfunction in the HV battery temperature sensor, the battery ECU assembly illuminates the MIL and set a DTC.

MONITOR STRATEGY

Related DTCs

P0A9C (INF P0A9B1C), P0AC6 (INF P0AC51C), P0ACB (INF P0ACA1C), P0AE9 (INF P0AE81C), P0BC3 (INF P0BC21C), P0C34 (INF P0C331C): Battery temperature sensor malfunction (stuck)

Required sensors/components

Battery temperature sensor

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

1 driving cycle

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Battery ECU assembly

DTC P0A9C (INF P0A9B1C) is not detected

DTC P0AC6 (INF P0AC51C) is not detected

DTC P0ACB (INF P0ACA1C) is not detected

DTC P0AE9 (INF P0AE81C) is not detected

DTC P0BC3 (INF P0BC21C) is not detected

DTC P0C34 (INF P0C331C) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. With ignition switch ON and wait for 10 seconds or more.[*1]

    HINT:

    [*1]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
  8. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A9B11.

Click here

CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here

NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)

(a) Check for DTCs.

Powertrain > HV Battery > Trouble Codes Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

"P0A9B1C, P0AC51C, P0ACA1C, P0AE81C, P0BC21C or P0C331C" only is output, or DTCs except the ones in the table below are also output.

A

DTCs of hybrid battery system in the table below are output.

B

DTCs of hybrid control system in the table below are output.

C

System

Relevant DTC

Hybrid battery system

P060A47

Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure

P060B49

Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure

P060687

Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message

Hybrid control system

P0A1F94

Hybrid/EV Battery Energy Control Module Unexpected Operation

(b) Turn the ignition switch off.

B

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

C

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

A

2.

CHECK DTC

(a) Check the DTCs that were output when the vehicle was brought to the workshop.

Result

Proceed to

"P0A9B1C, P0AC51C or P0ACA1C" is also output.

A

"P0AE81C, P0BC21C or P0C331C" is also output.

B

B

GO TO STEP 4

A

3.

CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR 0 to 2)

Click here

OK

REPLACE BATTERY ECU ASSEMBLY

NG

REPLACE HV BATTERY

4.

CHECK HV BATTERY (BATTERY TEMPERATURE SENSOR 3 to 5)

Click here

OK

REPLACE BATTERY ECU ASSEMBLY

NG

REPLACE HV BATTERY

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